Insulated terminal



April 24, 1928.

L M. LENz INSULATED TERMINAL Patented Apr. 24,l 1928.,

UNITED STATES PATENT OFFICE JACOB MAYO LENz, or Y' CHICAGO, ILLINoIs, AssIGNonTo RUNzEL-LENZ ELECTRIC MANUFACTURING COMPANY, 0F CHICAGoJLLINoIs, A CORPORATION oF ILLINOIS.

INSULATED Application led vApril 3,

My invention relatesV to insulated termi# nais for conductors and more particularly to insulated terminals for conductors used in cords for telephone receivers.v

Ordinarily the terminals on Va conductor used in a telephone receiver coi-'dare not` protected by any insulating i'natcrial.` Accord ingly, in certain types of apparatus a short` circuit voften occurs lbetween therbody portion of the terminal and some part of the telephone apparatus adjacent thereto, which is very undesirable particularly when used in connection with radio apparatus.

lVhile numerous types'o 'connecting terminals are provided on the end of conductor cords Aoft-hisr character, all of these embody a lcontact making portion and a body or, shank portion.- l

It is a purpose of. my invention to insulate the body orshank portion of the terminal from therear portion of the same. to-a. point spaced from't-he free end thereof tov leave the free end portion exposed to serve as a contact member. f -1 f -More particularly it is the purposesof Vmy invention to provide an insulating covering forall vof a Contact terminal provided on' the end of aconductor except the portion thereof that actually serves to make Contact, said insulating 'covering being preferably in the form of a sheath extending from the insulation on the conductor to the cntact `making portion of the terminal. Said sheath is preferably'madewof braided material'and the braiding` preferably begins at a point on :the insulatingv covering ofthe' conductor rearwardly of the terminal and extends over thev terminalto a. point adjacent1-the Contact making portion thereofi Then thebraidingI is preferably lappedback on itself to form a, double sheathing' overl the terminal, the outer layer :of said braiding extendingover the free end. porti-on of the braidingwhere the braidiijig Awas begun and exteniglsxan appreciable distance rearwardly thereof to "iirii'ilyrbind Ythe freerend ofthe braiding iii position. 'y Y "1f l Itv is still-a .further purpose of the inveii tion to Yprovide a conductor cordthat has a pair of conductors thereiiifaud which is pro'- vided with `free end portions, eachV containing a conductor with termiiials,eaclihaving a braiding extending over all but the con-V tact end thereof, said braiding being'lapped Y back'inthe manner referred to above so as to TERMINAL.;

i924. sensi No. 703,961. l

provide a, double layer of braiding over the terminal and said braiding extending rearwardly over the insulating covering on the conductorsy to the joint Where the conductors enter the portion of the cord containing the pair of conductors. l l ends slightly'beyond said joint and the other One of said braiding of said braidings forms a sheath raround both lSaid conductors to hold the same in paired relationship and embracing said iirst sheathing atthe free end thereof toptirmly secure said'free end in'pesition. y' Y v It is still another object ofthe invention to provide terminals that have reduced portions and enlarged portions so as, to provide. anfirregular surface lengthwise' thereof in combination with the above mentioned braid-` ing soy that said .braiding is held from move- K ment lengthwise of said terminals. i

l,Other objects and 'advantages of the iiiventioii'will appear ast-he description ofA the accompanying drawings proceeds. 'How-V ever, I desire. to have it distinctly understood Y ythatz-I do not intend to limit myself yto the exact details shown or described but that I intend tolinclude as part of my invention-al1 such obvious changes andl modifications of parts as'fwould loccur toa person skilled yin thisart and as would fall Within'thescope of thefclaims.V 'y v 4 f Inthe*drawings;' y ff Fig."Y 1 .isa fragmentary, elevational view vof a portion of thek cordembodyingmyliin vention; .and 1" Y Fig. r2is alongitudinal, sectional view vof the end portion ofa cord embodying my invention. .l y Referringin'detail to the drawings, the conductor' cord comprisesl an end portion having apair of conductors. 3 and 4 therein, said' condctorsbeing each covered vWit-h any suitable insulating covering,I preferably a braidedl covering, "such, as indicated in the drawings# The end portion 'of each` of said condiict'ors'is bared as is customary and suitable 4connectingy terminals y5 are; secured thereto.,` Said 'terminals 5 comprise, prefer-` ably,aa loop portion 6V having an opening 7 therein,'as is customary, .anda shank portion 8. The shank portion 8 is preferably integral With the loop portion and the entire terminal is preferably made of sheet metal.

The shank portion 8 comprises a pair of fingers 9 and 10 that are clamped around the insulating covering on the end of the ino cords 3 and 4 adjacent the bare part thereof and a sleeve portion 11 is provided on each of said members embracing the bare end of the conductor. rlhe Conductor is ordinarily woundgwitha binding wire`12 'which is exposed. between tliesleeve 11 and the fingers 9 and 10. The fingers 9 and 10, of course, also form sub-stantially a sleevelilre'portion. Thus, the terminal is provided with portions of greater diameter at the sleeve 11 and at the fingers 9and 10.

. In the form of terminal shown the eye portion is the portion that engages the cooperating terminal to malte the contact and vthe shanlportion is preferablyin many cases insulated/so that it can not accidentally make contact with any part adjacent thereto. In order to accomplish this purpose I provide an insulating covering comprising a braiding whichl begins atl the free end portion 13 thereof surrounding the insulating covering on the conductors 3v and4 and which is braided from thispoint outwardly on the shank portion of the terminal to substantially the contact portionV of the terminal at which point itis turned or lapped back, as indicated at 14, to thus; form an inner ply 15 vand an outer ply 16- of braided material over the shank portion of the terminal. The outer ply 16 extends'rearwardly over the free end portion-s 13 to hold the free' end portions in position. Then said outer plies continue as a single ply on the conductors 3 and 4, the ply on the conductor 3 being indicated by the numeral 17 and the ply on the conductor 4 bythe numeral 18l to distinguish between the two for a purpose which will be evident as the description proceeds.

The braiding 17 extends along the conductor 3 and terminates at the freeend portion 19, vwhile the braiding 18 extends over the conductor 4 until the conductor 3 lis paired therewith at which point the braiding is widened to include the conductor 3a-s well as the conductor 4, as indicated at 20.V The braiding 18V then continues asv an. outer sheath over the pair of conductors 3 and 4 to hold the same in paired relationship, as willl be clear from Fig. 1 and Fig. 2, and extends overthe braiding 17 at thefree end 19 thereof to bind'saidfree end firmly in position and cover tliesame. 1

y Due to the provision of the recesses or cut away portions of the terminals between the sleeve 11 and the fingers 9 and 10, the braid-v ingpwill be sligihtlyy necked in, asindicated at 21. As the braiding is done directly on' theA :terminal by'means of a suitable braiding machine and asthethreads from which thev braiding isinade` are under tension` this necked in portion willfirmly bind the sheath the terminals and prevent longitudinal movement of the terniinal'relative to the l sheath.

Having thus described myinvention what l desire to claim and secure by United States vLetters Patent is l. In a device of the character described,

a pair of conductors eachy hav-ing anfinsulating covering thereon, a terminal V"oni each of said conductors, said terminals each having a sheath of insulating material andan exposed end" portion serving as a contact, said sheaths extending rearwardly from said terminalsover said insulatingcovering, onek of said sheaths embracing lboth saidconductors at a point spaced from said terminals and the other of said sheaths lterininatiirg on its conductor under said first sheath to bind the free end thereof in position.

2. In a device of the character described, a pair of conductors each having an insulat-A ing covering thereon, a terminal on each of said conductors, said terminals each having a sheath of braided insulatingrmaterial and an exposed end portion serving as a Contact, said sheaths extending rearwardly from said' terminals over said insulating covering, one of said sheaths embracing both said conduc-v tors at a point spaced from said terminals and the otherof saidfsheaths'terininating,on its conductor under said first sheath to bind a point spaced from said terminalsandthe other of said sheathsl terminating` on its conductor under said first sheathto bind-ther free end thereof in position.

4. In a device of the character described,

a pair of conductors each having an insnlating covering thereon, a terminal on each of said conductors, said terminals each having a sheath of insulating material and anexposed end portion serving as acontaet, said sheaths each comprising an innerply extending froin a point onits conductor rear'- wardly of said terminal to'a point short of ing a sheath of insulatingmaterial and an.

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the endv of said terminal and a'second plyi` continuous with said first ply extending'rearwardly from said terminals over said insulating covering, one of saidsheaths einbrac ing both said conductors at a pointzspaced from said terminals and the other of saidV sheaths terminating on its conductor undery said first sheath to lbind the freeend thereof in position. p v

5. In aidevice of the character described,

a pair of conductors each having an insulat-` ing covering thereon, a terminal oneach of continuous with said irst ply extending rear- Wardly from said terminals over said insu` lating covering, one of said sheathseinbracing both said conductors at a point spaced from said terminals and the other of saidl sheaths terminating on its conductor under said first sheath to bind the free end thereof in position.

6. ln a device of the character described.l

a conductor, a terminal having a shank kernbracing said conductor and a braided insulating sheath having a single layercovering said conductor and two layers integral with said single layer covering said shank, said shank having a portion of reduced circumference and said two layers ot'said sheath 'having portions ,of reduced circumference engaging said reduced shank' portion. l

7. In a device of the character described,

a conductor having a terminal thereon, said terminal having a shank embracing said conductor and a braided insulating sheath covering the shank portion of said terminal and extending beyond said shank portion on said conductor, saidvshank having a reduced portion between the ends ythereota'nd said insulating sheath having a portion of restricted diameter seated in said reduced `portion to hold said sheath from'longitudinal movement onvsaid terminal.

In Witness whereof, I hereunto subscribe my name this 14th lday of 'Marclnv A. D. 1924.

JACOB MAYO LENZ. 

